you mean replace the packing, or put a dripless shaft seal on? replacing the packing took me about 15 minutes, and i haven't tightened the nut in a year (i used gore-tex GFO packing, completely dripless). Installing a dripless shaft seal (like PSS) involves removal of the shaft from the tranny and is a bigger job, but once its done you never have to think about it ever again.
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